javascript - 使用 angular.copy() 复制从 ngResource 返回的数据时出错

Question

我有以下代码:

getContents: function ($scope, entityType, action, subjectId, contentTypeId, contentStatusId) {
                entityService.getContents(entityType, action, subjectId, contentTypeId, contentStatusId)
                .then(function (result) {
                    $scope.grid.data = result;
                    angular.copy($scope.grid.data, $scope.grid.originalData);
                    $scope.grid.newButtonEnabled = true;
                }, function (result) {
                    alert("Error: No data returned");
                    $scope.grid.newButtonEnabled = false;
                });
            },

然后是entityService中的以下函数:

        getContents: function (entityType, action, subjectId, contentTypeId, contentStatusId) {
            var deferred = $q.defer();
            EntityResource.getEntities({ entityType: entityType, subjectId: subjectId, contentTypeId: contentTypeId, contentStatusId: contentStatusId },
               function (resp) {
                   deferred.resolve(resp);
               }
            );
            return deferred.promise;
        },

当我尝试执行 angular.copy 时，我收到一条消息:

TypeError: Object #<Object> has no method 'push'
    at Object.copy (http://127.0.0.1:81/Scripts/angular.js:600:21)
    at factory.getContents.entityService.getContents.then.$scope.grid.newButtonEnabled (http://127.0.0.1:81/Content/app/admin/services/grid-service.js:303:29)
    at deferred.promise.then.wrappedCallback (http://127.0.0.1:81/Scripts/angular.js:7303:59)
    at ref.then (http://127.0.0.1:81/Scripts/angular.js:7340:26)
    at Object.$get.Scope.$eval (http://127.0.0.1:81/Scripts/angular.js:8685:28)
    at Object.$get.Scope.$digest (http://127.0.0.1:81/Scripts/angular.js:8548:23)
    at Object.$get.Scope.$apply (http://127.0.0.1:81/Scripts/angular.js:8771:24)
    at done (http://127.0.0.1:81/Scripts/angular.js:10004:20)
    at completeRequest (http://127.0.0.1:81/Scripts/angular.js:10180:7)
    at XMLHttpRequest.xhr.onreadystatechange (http://127.0.0.1:81/Scripts/angular.js:10144:11) 

有没有人知道如何制作返回数据的副本。请注意，此数据来自 ngResource。此外，这似乎与我在 Stackoverflow 上发现的其他相关问题不同:TypeError: Object # has no method 'push' questions。有了这个问题，我可以恢复数据。它进入 $scope.grid.data 但在尝试 angular.copy 数据时给我一个错误。

Answer 1

仔细看看angular.copy doc :

destination(optional) – {(Object|Array)=} – Destination into which the source is copied. If provided, must be of the same type as source.

你从服务调用中得到的结果可能是一个数组；但是，您将 $scope.grid.originalData 初始化为对象或数组以外的其他内容，因此出现了此类型错误。

尝试弄清楚result是什么类型，并在调用angular.copy之前让$scope.grid.originalData成为相同的类型.